Ernő Téglás has obtained his PhD from SISSA, Trieste, where he investigated the role of probability representations in infants' understanding of uncertain events. Since then his interests focused on the origins of rationality in the development of deductive and probabilistic reasoning. His recent research is guided by questions targeting preverbal infants' access to abstract concepts and logical operations (funded by an ERC Starting grant), asking how do infants acquire the conceptual sophistication necessary for abstract combinatorial thought involved in everyday reasoning.